论文部分内容阅读
对1995年采自三门湾猫头深潭及附近海域的原状土样的沉积结构、沉积速率的计算及在历史海图地形对比、剖面重复水深测量等结果进行了分析,研究了该区底床的冲淤演变及其动力机制,结果表明:强劲的水动力条件维持了三门湾猫头深潭及附近海域底床冲淤的动态平衡,近百年来该区冲淤平衡且略有淤积,平均沉积速率为1～3cm/a。由于水体中的悬沙浓度和水动力条件存在季节性差异,使得底床存在冬、春季微淤,夏、秋季微冲的季节性循环。近30年来,围涂等频繁的人为活动使该区内湾纳潮面积和纳潮量分别减少了15%和22%,削弱了落潮优势流,造成深潭中心出现了较快的淤积,平均沉积速率超过10cm/a,且以风暴残留沉积为主。
The sedimentary structure and sedimentation rate of the intact soil sample taken from the deep pool of the head and the sea near the Catou head in Sanmen Bay in 1995 and the comparison of the topography in the historical charts and the repeated water depth measurement in the section were analyzed. The results show that strong hydrodynamic conditions maintain the dynamic balance between scouring and silting in the beach of Sanmen Bay Cathartic soils and the sea nearby, , The average deposition rate of 1 ~ 3cm / a. Due to the seasonal differences of suspended sediment concentration and hydrodynamic conditions in the water, the bed has some seasonal cycles of winter, spring siltation, summer and autumn micro-reds. In the recent 30 years, frequent man-made activities such as coating have reduced the area of the tidal flat and the tide in the bay by 15% and 22% respectively, weakening the dominant tidal current and resulting in faster deposition and average deposition in the center of the tundra. Rate over 10cm / a, and the main residual storm deposits.